Improvement in head-blocks for saw-mills



J. CAIN.

ead-Blocks for Saw-Mills.

Patented Sep. 3,1872.

Improvement in No. 131,051.

gttum AM FIIOTU-LITHOG/YAPH C mun 0550mm? PROCESS] UNITED STATES PATENTQFFICE.

JOHN GAIN, OF GREENVILLE, PENNSYLVANIA, ASSIGNOR TO HIMSELF AND JOSEPHW. EBERMAN, OF SAME PLACE.

' IMPROVEMENT IN HEADfBl-OCKS FOR SAW-MILLS.

:Specification forming part of Letters Patent No. 131,051, datedSeptember 3, 187,2.

Specification describing a new Improvement in Head-Blocks for Saw-Mills,invented by JOHN GAIN, of Greenville, in thecounty of Mercer and Stateof Pennsylvania.

In the accompanying drawing, Figure 1 is a top view of my improvedapparatus. Fig.

2 is a vertical longitudinal section of the same.

'ing shaft, which is worked bylever and ratchet-and-pawl connection toset the head and tail blocks. The invention also consists in combiningwith said shaft an eccentric rotary index, and arranging thereon afriction-ring and clamp, all as hereinafter more fully described.

In the accompanying drawing, the letter A denotes the shaft, which ishung in proper bearings at the back part of a saw-carriage, and reacheswith its ends behind the head and tail blocks, connecting with theelbows thereon by gearing or otherwise, so that when the shaft A isrevolved in one direction they will be moved forward, and backward whenit is revolved in the opposite direction. Two ratchet-wheels, a and b,are mounted near to each other upon the shaft A, and near to them,respectively, are hung upon the shaft loosely two disks, d and 6. Thesedisks connect, one above, the other below the shaft, by rods f g, withthe.crank of a rock-shaft, z, that is operated by a lever, B. The twodisks carry springpawls h h, that bear on the edges of theratchet-wheels a and b, as indicated in Figs. 1 and 4. By vibrating thelever B on its rock-pivot the disks will be oscillated in oppositedirections on the shaft A, and will swing their pawls along the ratchetwheels, respectively. That pawl which is drawn toward the rockshaftislips loose on its ratchet-wheel; but the other, moving away from therock shaft, engages in its ratchet-wheel and turns the shaft. Thus, asthe pawls are alternately moved in opposite, directions, the shaft Awill receive intermittent rotary motion to feed the log, by means of theelbows on the head and tail blocks, steadily forward. When the head andtail blocks are to be drawn back to admit a new log, the pawls h h mustboth be thrown out of gear withtheirrespective ratchet-wheels, so thatthe shaft A may be revolved in the opposite direction to effect suchpurpose. A shaft, 0, hanging in a frame, D, that is, at ll, hung to theshaft A, is, by bevel-wheels m m, connected with the said shaft A, asshown in Fig. 1. The shaft 0 carries a friction wheel,

a, at its outer end. When the shaft Ais used to feed a log in mannerabove specified, the frame D, carrying the shaft 0, is held horizontalby a lever, E, which is pivoted to avertical post, 0, of thesaw-carriage frame F, and rests on a stop, 11, as shown in Fig.5. Butwhen the pawls are thrown out of gear the lever E is swung clear of thestop 1) and allows the frame D of the shaft 0 to drop into the inclinedposition which is shown in dotted lines in Fig. 5,- until thefriction-wheel it strikes a stationary rail, q, placed under itimmovably. When the carriage is moved the wheel n, rolling on the railq, will be revolved, and thereby also the shafts C and A, the latter indirection proper for withdrawing the head and tail blocks to admit a newlog. The register ing apparatus consists, principally, of a cylin dricaldrum, G, which is hung between two plates, 'I and s, that are rigidlyaffixed to the saw-carriage. The drum G is open-ended, and is held oncircular shoulders of the plates 1* s, as is clearly shown in Fig. 2. Itembraces the shaft A eccentrically, and has internal gearing t, intowhich a pinion, u, that is mounted upon the shaft A, engages. Thus, whenthe shaft A is revolved the drum is also turned, but slower. Around thecircumference of the drum aremarks with figures, 11 1, 222,333, 850.,all spaced, so that when the drum, for example, is moved to bring onemark 1 to the longitudinal position previously occupied by the mark 1next to it, the shaft A will be turned so much as to feed the log oneinch; the same, in equal manner, with the other marks, the spaces 2corresponding with a feed of two inches of thelog the marks 3 with afeed of three inches, and so forth. To enable the necessary observation,a bar, H, is fastened to the edges of the plates 7" s, parallel to theaxis of the shaft A. Its straight edge constitutes the gage on which theposition of the marks on the drum can be observed. Therefore, when it isdesired to feed the log a certain distance at a time, theleverB isoperated until the changed position of the graduated drum indicates thatthe log has been fed such certain distance. In order to admit of a stillfiner degree of subdivision of the feed, or of irregular feeding, agraduated scale is marked on the edge of one of the plates r s. A ring,20, embraces the drum near the plate so marked, and can, by a lever, w,and clamp-spring y, be drawn so tight on the drum as to be carriedaround with the same. A finger or point, z, is formed on the ringw closeto the marked edge of theplate r or 8. When the drum is turned by themeans above described the degree of motion can be observed with greatnicety by the finger z moving along the graduated edge of r or s. Thering 20 is provided with a handle, a so that it may be turned intosuitable position.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent 1. The log-setting apparatus, composed of the shaft A,ratchet-wheels a b, loose disks d e, rods f g, pawls h h, rock-shaft i,and lever B, all arranged to operate substantially as herein shown anddescribed.

2. The shaft G, hanging in the vibrating frame D, and carrying ,thefriction-wheel 12, when arr nged to gear into the shaft A, substantiallyas herein shown and described.

JOHN (JAIN.

Witnesses:

WM. BUCK, F. BOYER.

